EP 0714092 A1 19960529 - Information recording and reproducing apparatus
Title (en)
Information recording and reproducing apparatus
Title (de)
Informationsaufzeichnungs/-wiedergabegerät
Title (fr)
Appareil d'enregistrement/lecture d'information
Publication
Application
Priority
JP 28779694 A 19941122
Abstract (en)
An information recording and reproducing apparatus comprises an optical device for causing a light beam to impinge upon a disc having a spiral guide groove along which a control signal is substantially recorded for scanning the spiral guide groove; a light beam modulating portion operative to intensity-modulate the light beam incident upon the disc in response to an information signal so that the information signal is intermittently recorded on the disc and operative further to cause the light beam to keep a relatively small intensity during a period in which the recording of the information signal is temporarily interrupted; a photo-detecting portion for detecting the light beam coming from the disc; a read signal processing portion operative to obtain, based on a detection output from the photo-detecting portion, a read output signal containing a read output of the control signal and a total amount signal corresponding to momentary total light amount of the light beam received by the photo-detecting portion; a variable gain control portion operative to perform a gain-control to the read output signal in response to the total amount signal when the light beam coming from the disc is detected by the photo-detecting portion; and a signal reproducing portion for obtaining a reproduced output of the control signal on the strength of the read output signal having been subjected to the gain-control performed by the variable gain control portion. <IMAGE>
IPC 1-7
IPC 8 full level
G11B 7/00 (2006.01); G11B 7/0045 (2006.01); G11B 7/09 (2006.01); G11B 7/125 (2006.01); G11B 11/105 (2006.01); G11B 20/10 (2006.01)
CPC (source: EP KR US)
G11B 7/08 (2013.01 - KR); G11B 7/0941 (2013.01 - EP US); G11B 11/10595 (2013.01 - EP US); G11B 20/10009 (2013.01 - EP US); G11B 7/0904 (2013.01 - EP US); G11B 7/0938 (2013.01 - EP US); G11B 11/10578 (2013.01 - EP US)
Citation (search report)
- [A] EP 0371880 A2 19900606 - SONY CORP [JP]
- [A] EP 0623921 A1 19941109 - SONY CORP [JP]
- [A] EP 0303373 A1 19890215 - CANON KK [JP]
Designated contracting state (EPC)
AT DE FR GB IT NL
DOCDB simple family (publication)
EP 0714092 A1 19960529; EP 0714092 B1 20020731; AT E221689 T1 20020815; AU 3789695 A 19960530; AU 692938 B2 19980618; CA 2163176 A1 19960523; CA 2163176 C 20051115; CN 1080917 C 20020313; CN 1135637 A 19961113; DE 69527599 D1 20020905; DE 69527599 T2 20030403; JP H08147699 A 19960607; KR 960019138 A 19960617; MY 114205 A 20020830; US 5742578 A 19980421
DOCDB simple family (application)
EP 95308327 A 19951121; AT 95308327 T 19951121; AU 3789695 A 19951116; CA 2163176 A 19951117; CN 95120393 A 19951122; DE 69527599 T 19951121; JP 28779694 A 19941122; KR 19950044496 A 19951122; MY PI19953512 A 19951117; US 56054595 A 19951117